platform/i2c busses: pm runtime and system sleep

On Friday, February 18, 2011, Rabin Vincent wrote:

On Thu, Feb 17, 2011 at 20:55, Rabin Vincent [off-list ref] wrote:

quoted

This will solve the platform vs AMBA bus, but shouldn't we really be
aiming for consistent behaviour between these and the other busses such
as I2C and SPI, which are also usually commonly used on the same
platforms and are using GENERIC_PM_OPS?

Should we be auditing all platform drivers and then switch platform to
the GENERIC_PM_OPS?

Or should the two points (1) and (2) be not handled in the bus at all
and be left to individual drivers (in which case we should audit i2c and
spi and change GENERIC_PM_OPS)?

How about something like the below?  If we have something like this, we
can just switch platform to GENERIC_PM_OPS and add the
pm_runtime_want_interaction() (or something better named) call to the
i2c and spi drivers using runtime PM.

Why don't we make platform_bus_type behave along the lines of generic ops
instead?

Rafael